Texture3D

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/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield
 *
 * This library is open source and may be redistributed and/or modified under
 * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
 * (at your option) any later version.  The full license is in LICENSE file
 * included with this distribution, and on the openscenegraph.org website.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * OpenSceneGraph Public License for more details.
*/
 
#ifndef OSG_TEXTURE3D
#define OSG_TEXTURE3D 1
 
#include <osg/Texture>
 
namespace osg {

class OSG_EXPORT Texture3D : public Texture
{
 
    public :
 
        Texture3D();
 
        Texture3D(Image* image);
 
 
        template<class T> Texture3D(const osg::ref_ptr<T>& image):
                    _textureWidth(0),
                    _textureHeight(0),
                    _textureDepth(0),
                    _numMipmapLevels(0)
        {
            setImage(image.get());
        }

        Texture3D(const Texture3D& text,const CopyOp& copyop=CopyOp::SHALLOW_COPY);
 
        META_StateAttribute(osg, Texture3D,TEXTURE);

        virtual int compare(const StateAttribute& rhs) const;
 
        virtual GLenum getTextureTarget() const { return GL_TEXTURE_3D; }

        void setImage(Image* image);
 
        template<class T> void setImage(const ref_ptr<T>& image) { setImage(image.get()); }

        Image* getImage() { return _image.get(); }

        inline const Image* getImage() const { return _image.get(); }

        virtual bool isDirty(unsigned int contextID) const { return (_image.valid() && _image->getModifiedCount()!=_modifiedCount[contextID]); }
 
        inline unsigned int& getModifiedCount(unsigned int contextID) const
        {
            // get the modified count for the current contextID.
            return _modifiedCount[contextID];
        }

        virtual void setImage(unsigned int, Image* image) { setImage(image); }

        virtual Image* getImage(unsigned int) { return _image.get(); }

        virtual const Image* getImage(unsigned int) const { return _image.get(); }

        virtual unsigned int getNumImages() const { return 1; }
 

        inline void setTextureSize(int width, int height, int depth) const
        {
            _textureWidth = width;
            _textureHeight = height;
            _textureDepth = depth;
        }

        inline void getTextureSize(int& width, int& height, int& depth) const
        {
            width = _textureWidth;
            height = _textureHeight;
            depth = _textureDepth;
        }
 
        void setTextureWidth(int width) { _textureWidth=width; }
        void setTextureHeight(int height) { _textureHeight=height; }
        void setTextureDepth(int depth) { _textureDepth=depth; }
 
        virtual int getTextureWidth() const { return _textureWidth; }
        virtual int getTextureHeight() const { return _textureHeight; }
        virtual int getTextureDepth() const { return _textureDepth; }
 
 
        class OSG_EXPORT SubloadCallback : public Referenced
        {
            public:
                virtual void load(const Texture3D& texture,State& state) const = 0;
                virtual void subload(const Texture3D& texture,State& state) const = 0;
        };
 
        void setSubloadCallback(SubloadCallback* cb) { _subloadCallback = cb;; }
 
        SubloadCallback* getSubloadCallback() { return _subloadCallback.get(); }
 
        const SubloadCallback* getSubloadCallback() const { return _subloadCallback.get(); }
 

        void setNumMipmapLevels(unsigned int num) const { _numMipmapLevels=num; }

        unsigned int getNumMipmapLevels() const { return _numMipmapLevels; }
 

        void copyTexSubImage3D(State& state, int xoffset, int yoffset, int zoffset, int x, int y, int width, int height);
 

        virtual void apply(State& state) const;
 
    protected :
 
        virtual ~Texture3D();
 
        void computeRequiredTextureDimensions(State& state, const osg::Image& image,GLsizei& width, GLsizei& height,GLsizei& depth, GLsizei& numMipmapLevels) const;
 
        virtual void computeInternalFormat() const;
        void allocateMipmap(State& state) const;
 
        void applyTexImage3D(GLenum target, Image* image, State& state, GLsizei& inwidth, GLsizei& inheight, GLsizei& indepth, GLsizei& numMipmapLevels) const;

        mutable ref_ptr<Image> _image;

        mutable GLsizei _textureWidth, _textureHeight, _textureDepth;

        mutable GLsizei _numMipmapLevels;
 
        ref_ptr<SubloadCallback> _subloadCallback;
 
        typedef buffered_value<unsigned int> ImageModifiedCount;
        mutable ImageModifiedCount _modifiedCount;
 
};
 
}
 
#endif